[312-308 B.C.]
In the ensuing year, a convention was concluded between Antigonus, on one side, and Cassander, Ptolemy (the Egyptian) and Lysimachus, on the other, whereby the supreme command in Macedonia was guaranteed to Cassander, until the maturity of Alexander son of Roxane; Thrace being at the same time assured to Lysimachus, Egypt to Ptolemy, and the whole of Asia to Antigonus. It was at the same time covenanted by all, that the Hellenic cities should be free. Towards the execution of this last clause, however, nothing was actually done. Nor does it appear that the treaty had any other effect, except to inspire Cassander with increased jealousy about Roxane and her child; both of whom (as has been already stated) he caused to be secretly assassinated soon afterwards, by the governor Glaucias, in the fortress of Amphipolis, where they had been confined. The forces of Antigonus, under his general Ptolemy, still remained in Greece. But this general presently (310 B.C.) revolted from Antigonus, and placed them in co-operation with Cassander; while Ptolemy of Egypt, accusing Antigonus of having contravened the treaty by garrisoning various Grecian cities, renewed the war and the triple alliance against him.
Polysperchon—who had hitherto maintained a local dominion over various parts of Peloponnesus, with a military force distributed in Messene and other towns—was now encouraged by Antigonus to espouse the cause of Heracles (son of Alexander by Barsine), and to place him on the throne of Macedonia in opposition to Cassander. This young prince Heracles now seventeen years of age, was sent to Greece from Pergamus in Asia, and his pretensions to the throne were assisted not only by a considerable party in Macedonia itself, but also by the Ætolians. Polysperchon invaded Macedonia, with favourable prospects of establishing the young prince; yet he thought it advantageous to accept treacherous propositions from Cassander, who offered to him partnership in the sovereignty of Macedonia, with an independent army and dominion in Peloponnesus. Polysperchon, tempted by these offers, assassinated the young prince Heracles, and withdrew his army towards Peloponnesus. But he found such unexpected opposition, in his march through Bœotia, from Bœotians and Peloponnesians, that he was forced to take up his winter quarters in Locris (309 B.C.). From this time forward, as far as we can make out, he commanded in southern Greece as subordinate ally or partner of Cassander.
The assassination of Heracles was speedily followed by that of Cleopatra, sister of Alexander the Great, and daughter of Philip and Olympias. She had been for some time at Sardis, nominally at liberty, yet under watch by the governor, who received his orders from Antigonus; she was now preparing to quit that place, for the purpose of joining Ptolemy in Egypt, and of becoming his wife. She had been invoked as auxiliary, or courted in marriage, by several of the great Macedonian chiefs, without any result. Now, however, Antigonus, afraid of the influence which her name might throw into the scale of his rival Ptolemy, caused her to be secretly murdered as she was preparing for her departure; throwing the blame of the deed on some of her women, whom he punished with death.
All the relatives of Alexander the Great (except Thessalonice wife of Cassander, daughter of Philip by a Thessalian mistress) thus successively perished, and all by the orders of one or other among his principal officers. The imperial family, with the prestige of its name thus came to an end.
PTOLEMY IN GREECE
[308-307 B.C.]
Ptolemy of Egypt now set sail for Greece with a powerful armament. He acquired possession of the important cities—Sicyon and Corinth—which were handed over to him by Cratesipolis, widow of Alexander son of Polysperchon. He then made known by proclamation his purpose as a liberator, inviting aid from the Peloponnesian cities themselves against the garrisons of Cassander. From some he received encouraging answers and promises; but none of them made any movement, or seconded him by armed demonstrations. He thought it prudent therefore to conclude a truce with Cassander and retire from Greece, leaving however secure garrisons in Sicyon and Corinth. The Grecian cities had now become tame and passive. Feeling their own incapacity of self-defence, and averse to auxiliary efforts—which brought upon them enmity without any prospect of advantage—they awaited only the turns of foreign interference and the behests of the potentates around them.
The Grecian ascendency of Cassander, however, was in the following year exposed to a graver shock than it had ever yet encountered, by the sudden invasion of Demetrius called Poliorcetes, son of Antigonus. This young prince, sailing from Ephesus with a formidable armament, contrived to conceal his purposes so closely, that he actually entered the harbour of Piræus (on the 26th of the month Thargelion—May) without expectation, or resistance from any one; his fleet being mistaken for the fleet of the Egyptian Ptolemy. The Phalerean Demetrius, taken unawares, and attempting too late to guard the harbour, found himself compelled to leave it in possession of the enemy, and to retire within the walls of Athens; while Dionysius, the Cassandrian governor, maintained himself with his garrison in Munychia, yet without any army competent to meet the invaders in the field. This accomplished Phalerean, who had administered for ten years as the viceroy and with the force of Cassander, now felt his position and influence at Athens overthrown, and even his personal safety endangered. He obtained permission to retire to Thebes, from whence he passed over soon after to Ptolemy in Egypt. The Athenians in the city declared in favour of Demetrius Poliorcetes; who however refused to enter the walls until he should have besieged and captured Munychia, as well as Megara, with their Cassandrian garrisons. In a short time he accomplished both these objects. Indeed energy, skill, and effective use of engines in besieging fortified places, were among the most conspicuous features in his character; procuring for him the surname whereby he is known to history. He proclaimed the Megarians free, levelling to the ground the fortifications of Munychia, as an earnest to the Athenians that they should be relieved for the future from all foreign garrison.